We are making a life, we are living in this life, with or without intention. We have no intention to make harm of someone or something, we are not breaking any rules, we are just living; but, this is equal to san go, the three karma. No matter where we are, what kind of occasion, we are making a sin.
Ten Aku, Juzenkai: Ten evil subjects and points of behavior which turn ourselves to reflect. Reflection is the best, highest protection and solution. If we stop the three san go, this means that we have to die. Without our physical body, with no actions recognized, this means that you no longer live in this world and you have become a Buddha/Tathagata. We reflect means that we live. We create karma and then we forgive, we grow up, we convert, etc. Life is like the cat and mouse race and we always chase after our shadow.
We have a physical body and internal feelings and outside feelings. We are consuming or producing, so things are always changing, and we are, or should be, reflecting on what we do as well. This process creates friction. We don't want to die, we want to live, but we create sins and karma. While we have the three karma we should be purified, and while we purify we have to live with the three karma. This friction creates a sponge. We have to live with creating the sponge to polish both surfaces. Every time we create the josango mudra, we push the middle fingers out because they represent the fire, which needs to be out in this context because it represents ego/karma. The fire is one of the power sources to move something, but in the context of san go, fire should be translated as ego/karma. If we push the karma out from our body, we are purifying our sins out of our behavior. Every time we form the josango mudra, remember the meaning: "Eliminate and purify the ten evil acts you have committed through the three actions [of body, speech, and mind], thus perfecting a pure ablution of the inner mind." -Juhachido Nenju Kubi Shidai.
The kanso (imagination) part of the practice is very important. The more we practice, our imagination speed and flexibility is well-developed so that we can have good moments of reflection. We reflect because we are able to imagine; Without imagination, reflection can never happen.